Arc-lamp.



W. F. WARNER.

ARC LAMP.

APPLIUATIOH II-LED JUNE 25, won.

OWL

0 0 W mmmdx T N Mm m m m M Z -7 WITIVESSES:

ATTORNEY W. F. WARNER.

ABG LAMP.

APPLICATION FILED JUNE 25, 1906. 91 4,684, Patented Mar. 9, 1909. BSHEETS-SHEET 2. E 2.

x u I l 5 5 57 r 34 t 33 35 6B WITNESSES: lfiVENTOR APPLICATION FILEDJUB'B 25, 1906.

Patented Mar. 9, 1909.

B SHEETS-SHEET 3.

WITNESSES wzfimzn=cm W I ll" r l5 I INVENLJR BY i n A TTORNE Y W. F.WARNER.

ABG LAMP.

APPLIOATIOH FILED JUIB 26, 1906. 914,684, Patented Mar. 9, 1909. 6SHEETS-SHEET 4.

Ill 8 V 51 57 4 2a 24 I 63 s 7 44 4 "E 31 32 26 L41 I 8 WITNESSES: V 20IN VEN TOR MY/Ib'n; F: "fryer n414 I By %w; a 19 ATT NE! W. F. WARNER.

ABG LAMP.

APPLICATION FILED JUNE 25, 1906. 914,684, Patented Mar. 9, 1909. 3BHEETSSHEHT 6.

IIIIL l mu III A TTURNE rf WILLIAM F. WARNER, OF

MUNOIE, INDIANA, "ASSIGNOR TO WARNER ARC LAMP COMPANY, OF MUNGIE,INDIANA, A CORPORATION.

ARC-LAMP.

Specification of Letters Patent.

Patented March 9, 1909.

Application filed June 26, 1906. Serial No. 323,826.

strength of the current, and consists in a new means for operatinga'olutcli so as to release the carbon and restrike the arc of a certainlength and .at certain predetermined intervals irrespective of theconsumption of the electrodes and consequently of variation of the-,arcvoltage.

Ihave shown the invention embodied in the lamp mechanism hereindescribed.

My invention is clearly described and illustrated in the accompanying secification and drawings, in which similar etters and numerals ofreferencerefcr to similar parts throughout the several views.

Figure 1 is a front view, Fig. 2 is a side view, and Fig. 3 is a rearview of my improved arc lamp complete, with jacket and glassewareremoved and in each view the crown late being shown as having a portionthereoi broken away. Fi 4 is {a vertical central sectional view of Fig.2. Fig. 5 is a horizontal sectional view on the line 5-5 Fig. 1. Fig. 6is a top plan view of -Fig.' 1. Fig. 7 is a detached vertical sectionalview of the sheath-tube. Fig. 8 is a detached elevation of thesheath-tube and carbon-holder removed. Fig. 9 is a detached enlargedview of the carbon-grip removed. Fig. 10 is an enlarged detached view ofthe regulator removed. Fig. 11 is a detached enlarged view of thesnap-switch removed. Fig. 12 is a detached vertical central sectionalview of the heat coil removed. Fig. 13 is a detached enlarged view ofthe carbon-holder removed. Fig. 14 is a diagrammatic view showin thesystem of wiring and the courses of the e ectrical circuits.

1 designates the crown-plate, circular in form and provided with thedownwardly extending continuous flange adapted to afford a water shedfor the mechanism below, also to receive the jacliet and inclose theworking parts immediately below. Depending from the inner portion of thecrownplate and formed integral therewith are the bosses 2. Secured tothese bosses by suitable screws and insulated therefrom is the collar 3into which is screwed and which supports the metallic sheath-tube 4 andprovided with the lon itudinal continuous slot 5 in one side thereo asplainly shown in Fig. 8, the function of which slot will be hereinafterpointed out.

6 designates the circular metallic center table with ample flanges 8 and9 and having central vertical opening through which is freely insertedthe sheath-tube as plainly shown in Fig. 4. The tubular columns 10 and11 formed integral with and connecting the flanges are insulated upontheir interiors and perform the functions hereinafter described.

In assembling the framework of my lamp the sheath-tube is secured, asabove described, to the crown-plate, then its lower end is assed throughthe center table and d into the support late 12 which is also circularin form, metallic, and provided with the enlarged central portion 13threaded on its interior to receive the sheath-tube and provided withthe downwardly extending stems 14 formed integral therewith, and to thebottoms of which stems are secured rigidly the disk 15 made ofnon-conducting and heat resisting material such as slate or lava andhaving the circular continuous flange 16 on its under, side to which asuitable glass globe for inclosin the are is adapted to bear. The center0 this disk is suitably bored for the easy passage of the movable carbonwhereby the same is retained slidably in correct position. Thecenter-table is then secured in proper osition on the supportlate 12 butinsuated therefrom by the ayer'of insulation 17.

Suitably secured to the disk 15 are the depending metallic rods 18 whichsupport, at proper distance below the collar 19 provided with centralaperture for the reception, and a suitable set screw for securing andretaining rigidly in position, the lower carbon 20.

Supported on the upper flange of the center table are the four posts 21,22, 23 and 24 rigidly secured to but insulated from said flange. 25 and26 designate contact plates secured to but insulate from the bottom ofthe posts ,22 and 23 respectively to which contact plates are connectedthe wires here inafter referred to. Mounted between the posts 21 and 22is the solenoid 27, and between the posts 23 and 24 is the solenoid 28.These solenoids are retained in their ropcr positions transversely andvertically y the retaining-plates 29 provided with the transverselycxtendin projections 30 with suitable a ertures w lereby they may beeasily slip e onto the posts, and provided also Wit 1 the verticalprojecting studs 31 whereby the solenoids, when the retaininglates areplaced in positon, will be retaine in accurate position. As plainlyshown in Fig. 5 these retaining-plates each are provided with am leopemngs whereb in the assembling or disassembhng of my device the armature may be easily inserted. ()n the 21, 22, 23 and 24 underneath andalso a ove the retaining-plates 29, are provided the coil-springs 32 thefunction of which springs is to neutralize or absorb the vibration ofthe solenoids when alternating current is in use in the operation of thelamp, as will be hereinafter referred to.

33 and 34 designate o positely positioned standards the bases 0 whichare ri idly secured to the tops of the osts 24 an 21, 22 and 23respectively. hese standards are provided at the upper ends withtransverse holes in which reside the narrow-strip bearings 35 of thewalking-beam 36. This walking-beam has the arms 37 and 38 the functionsof which will be hereinafter explained, and is so formed on its upperface that suitable vertical fac s are provided, against which are heldrigid y-in position the narrow-stri bearings 35, all as plainly shown inFig. 5. y this construction are obtained bearings for the walking-beamof minimum friction. Apertures are provided in the outer ends of thearms 37 in which are inserted the detachable links38 upon which aresuspended at roper height the armatures 39., Pivota y sup orted by thepins 42 on the arlns 38' are t e suspenders 40 of suitable length andprovided at their lower ends with the longitudinal slots 41 in whichosts slotsare loosely supported the cross-beam 42 prov1ded at its centerwith the downwardly extending sleeve against the bottom of which issecured, but insulated therefrom, the contact plate 44.

Secured r1 'dly in the cross-beam 42 and sleeve 43 t e vertical]disposed rod 45 its upper ortion being hel slidmgly in true position ythe horizontally projecting lug 34 of the standard 34, and its lowerortion bemg retained slidingly in true position in the 00 um 11 whichconstitutes suitable guide and insulation for same as shown in Fig. 4.Secured to the lower end of this rod 45 is the bar 46 to the free end ofwhich is siidingiy and pivotally connected the vertical bar 47 its lowerend being ivotally connected to the outer end of the c utch 48 a detailof which is shown in the detached view Fig. 9. This clutch is made ofsuitable non-conductin heat-resistin rigid material, preferably 0 lava,and ta en in connection with my ingenious device for its actuation andoperation forms one of the features of my invention. This clutch islprovided at its free end portion with suitab a vertically extendingaperture through which the movable carbon 49 passes freely; normallythis clutch 48 rests on the late 16, the bar 46 in the top of the slotof ar 47, and the cross-bar 42 resting in the bottom ends of the slots41, the walking beam being in its normal horizontal position, and thecarbons in contact. It will be readily seen that when the walkin -beamis actuated the vertical rod 45 will e raised thus the hinged end of theclutch will be raised and the clutch will immediately grip the carbon 49and it will simultaneously be raised.

The descri tion hereinafter of the wiring and the switc mechanism willdisclose that the solenoids 27 and 28 will be ener 'zed alternately atcertain intervals, whic operation, by the magnetization alternately ofthe armatures 39 Will 'cause'the actuation of the walking beam.

After the carbon has been raised, the tendency would be for the rod 45and its connected parts and the carbon 49 to drop forcibly; to overcomethis and also to revent the sudden jerk or twitch of the wa king beamwhen the circuit is switched, I have provided the dash- 0t 50 pivotallysecured at its top by suitab e arm to one of the sus enders 40 and thepiston rod thereof pivota 1y secured at its lower end, by suitable arm,to the o posite'suspender 40, thus is afforded su cient cushion wherebysudden movement of the walking beam is prevented and the descent of thecarbon may be rendered noiseless and steady.

Rigidly secured to the flangeS of the metallic center-table andinsulated therefrom is the standard 51 having the integrally formed,horizontally extending base portion 52 raised and free from the flangeso as to make room for the passing of wires thereunder and to affordbase for the rigidly secured vertically extending resilient rod 53 andthe heat-co1l 54 covered by a suitable jacket, which rests u on saidbase but is insulated therefrom as s own in Fig. 12. The upper ortion ofthe standard 51 is provided with t e projection 55 where it is rigidlysecured to but insulated from the standard 33 the purpose of which isthus to stiffen the structure. Pivotally secured to the flange 56 of thestandard 51 depends the rocker-bar 57 of suitable length land providedat itslow er end withthe studs 58 and having its end terminated in suchform that the end 59 'of the rockerbar may pass the shaft 60 upon whichis pivotally supported the snap-switch 61, as shown in Fig.

1 and Fig. 11. This snap-switch is formed of sheet metal U-shaped incross section, pivl oted near its upper end having the upwardly iextending arm 62 and the downwardly extending tongue 63, the latterbeing twisted so as to extendtransversely and provided with the wellknown thin-strip contacts on either side thereof. Connecti transverselythe two sides of the snap-switc i is the small shaft 64. Pivotallyconnected to the lower end 59 of the rocker bar is the slide-bar 65 itsfree end bifurcated and adapted to reside slidingly upon the shaft 64;65 designates a coil spring surrounding the slide-bar 65, its oppositeends bearing against the head of the s 1 e bar 65 and the shaft 64, asplainly showninFig. 11.

66'and 67 desi nate contact osts secured to but insulated lrom the stanard 51, their rear endsv extending through the standard and ads ted toreceive the certain Wires to be p hereina ter, the diagrammatic View,re-

ferred to. To facilitate the procurement of nice contact of thevppsts 66and 67 with the snap-switch, the suitable thin-strip contacts aforesaidhave been provided.

Rigidly secured to the top of the resilient post 53 that has its bottomsecured to the ass 52 is the horizontal bar-68 its one end beingconnected to the rod 53" that extends downwardly and is secured to thebase 52. About this rod 53, is retained the heat coil 54 properlyinsulated from the said rod, the base 52, and the bar 68. The oppositeend of the bar 68 ,is pivotally connected'to the rocker bar 57 that ispivotally supported by the flange 56 of the standard 51 as hereinbeforedescribed. It is obvious that by the slightest increase of the distancebetween the base 52 and the bar 68 at the rod 53, the bar 68 will bemoved. With the parts arranged as just described the direction of suchmove ment of the bar 68 will be in a line drawn through the rod 53 andthe post 53, and toward the rocker bar. As the rod 53 be comes heatedsuch elongation thereof due to its ex ansion, occurs, that the bar 68 ismove in the manner aforesaid. l'Vith the cooling of the. heat coil andthe rod 53, the bar'68' will be returned-to its normal position as it apears in Fig. 1.

69 esignates a protruding horizontal lug on the si e of the standard 51provided as a guide upon which the'rocker barmmay slide. 70 designates asuitable binding post on the snap switch for securing thereto certainwires to be hereinafter described. These parts all when in normalposition appear I as shown inFilg. 1 and Fi 10, the rocker-bar 57 havingits wer end posed toward the leftwith its stud 58 holdingthe snapeswitchnormally contact'with the contact-post 66. It will be understood thatevery slight movement toward' right at that portion of the rockerbarwhere'the horizontal bar 68 is piv- 65 ote'd, is required to obtain thestroke necessary at the line of the studs 58, and that a slightexpansion of the heat-coil 54 will cause a movement of the horizontalbar 68. This horizontal bar 68. being connected to the rocker-bar inthemanner as heretofore stated, and rigidly secured to the resilient rod53 against erpendicular movement, will, by the considerablepower-exerted b the expansion of the heat-coil be warped orwardly.

As it proceeds, the coil spring is strained and when the rocker-barpasses the center of its stroke, the snap-switch instantly severs itscontact with post 66 and makes instant contact with post 67 where itremains in contact as the rocker-bar proceeds until the stud 58 stopsits progress; with the cooling of the heat coil, due to its having beenshort circuited as will be hereinafter described, the rocker bar movesrearwardly; as it recedes, the coil spring 65" is strained and when therocker-bar passes the center of its stroke, the snap-switch instantlysevers its contact with contact-post 67 and makes instant contact withost 66, where it re.- mains in contact as t e rocker-bar recedes untilthe stud 58 stops its recession.

7 l designates a suitable switch for openinlg the circuit between thebinding posts and P.

72 designates suitable means secured to the top of the'crown platewhereby the lamp may be supported.

In the construction and operation of series are lamps as atpresentevised the well known shunt coil is the .means employed wherebythe retaining of proper dlstance a art of the carbons is song t to beaccomp 'shed. The objection to this is that a certain portion of thecurrent is continually being consumed through the shunt coil, and theregulation of the arc is only partially accomplished, the carbons notinfrequently coming into contact with each other and remaining incontact, or sticking. and causing the extin ishment of the light. Alsothe length of t e are fluctuates so that a flickering and unsteady lightresults, and the continual fluctuation of the amount of current, due tothe imperfect means of regulation of the length of the arc, is notremedied. Moreover theutility of lamps so devised depends upon thedelicate ad ustment and perfect working condition of the various parts,and upon the degree of temperature of such parts, more particularly ofthe shunt coil. The least amount of friction of the operating mechanismcauses a corres onding variation in the adjustment of the am The mostserious objection however is, t at in lamps, either shunt ordifferentially controlled, the variation in temperature to which alllamps are necessarily subject roduces variation of the amount of theresistance of the shunt coil, thus is caused variation in the voltage atwhich such lampswill operate; this variation is commonly referred to asvolt creepage or creeping of the voltage around the arc of the lamp. Andfurther, such lamps, owing to the difference in the nature of aternating and continuous current, must be constructed and the coilswound with particular reference as to whether same is to be operated byeither continuous or alternating current.

Results of my invention are that many of the foregoing faults areovercome and by the improved combination and arrangement of therespective parts described the movable carbon is released and the arc isrestruck of a certain length and at pro-determined intervals,irrespective of the arc voltage.

To accomplish perfect gaging of the distance apart of the carbons and sothat the length of the arc may be aged to operate upon a pre-determinedvo ta e, the gaging device shown has been rovi ed, composed of thesuitably formed p ate 73, its one end enlarged" and formed curvilinearand with a curved scale marked thereon and rigidly secured tothe stems14 above the clutch 48. Pivotally secured to the face of this plate bythe screw 73' is the pointer 74 having an enlarged lower portion 74"shaped into such curve, that when the pointer is adjusted with referenceto the voltage desired to be consumed by the lamp, and so indicated onthe scale, the portion 74' will assume such position with reference tothe clutch, that in the u ward movement of the carbon 49 the cutch willbe stopped at the proper predetermined position. At the opposite endofthe ointer is rovided a curvilinear slot within which resides the setscrew 75 secured to the plate 73 whereby the pointer may be rigidlysecured in desired position. By adjustment of the point of the pointerto the numeral on the scale,.the precise adjustment of the carbons maybe gaged and maintained.

76 designates the carbon-holder composed of a smoothly finished shortmetallic tube of suitable length, its lower end bein slit, as shown inFig. 13 and beveled slight y on its inner edge so that the carbon may beeasily inserted and will be firmly retained therein. In the interiorupper portlon are the tongues 77 so adapted that when the carbon isinserted its passage beyond the proper distance is prevented.

78 desi mates astud secured in the carbon holder a apted to protrude andto reside slidingly in the slot 5 of the sheath tube; this slot is ofsuch len b that the carbon-holder may not be pus ed upwardly beyond itsproper position, and when the carbon is consumed, may not traveldownwardl beyond its proper position. Provided in t e to of thecarbon-holder is the suitable bun mg 0st 79 to which is secured theflexible conuctor G as shown in Fig. 4. This flexible conductor is comosed of flexible copper wire cable and is 0 such length that thecarhon-holder in its movement upwardly and proved manner.

To assist to-the clear understanding of the several views in thedrawings, the wires are not shown, but their arrangement and connectionswill be clearly understood b inspection of the diagrammatic view as sown in Fig. 14.

In this improved-lamp, when in readiness for operation, the parts are inthe respective positions as shown in Fig. 1, Fig. 2 and Fig. 3, thecarbons being in contact, the walking beam supporting the armatures ofthe solenoids being horizontal, both of the suspenders 40 and thecrossbar 42 be' supported thereby, and the carbon-clutch ein at rest onthe disk 15, the contact plate 44 eing in contact with the contacts 25and 26, and the snap -switch in contact with the contact post 66.Continuous or alternating current may be introduced. With the opening ofthe switch 71 the current passes along the wire B to the contact plate26 where it divides, a portion going through the plate 26, contact 44and plate 25 and the resistancecoil C to the post 1N Thus is provided acircuit for the current when the carbons will have been consumed. Theremainder of the current passes along the wire D, the line of leastresistance, through the contact 66 and snap-switch 63, thence along wireE around solenoid 27 thence through the heatcoil 54 made of Germansilver or othersuitable resistance wire, thence along the wire F throughcollar 3 and flexible-conductor G throu h the movable carbon 49 and thefixed car on 20, thence alon the rod 18 and the wire H to the post N. bearmature of solenoid 27 is thus first energised and moves downwardly,actuating the walking beam and causing upward movement of the crossbar42 supported by the Suspender 40, and secured to the plate 44, therebyhftin the plate 44 and opening the circuit throng the startin resistancecoil C whereb the entire force 0 the current is spent in t e circuit Ddescribed. The adjustment of the mechanism is such that instant] afterthe raising of the plate 44 the car on-clutch 48 has rasped the arbon 49and separated same rom the fixed carbon 20, thus causing the arc to bereduced. As the current continues to how t rough the circuit D theheatrcoil 54 expands, causin gradual movement of the rocker-bar 57 w ichcauses the coil spring,

65 to be strained and-instantaneous trans position of the snap-switch 63which then contacts with the circuit and rendering in'o erative thesolenold 27 thus, the current owing 'in through the ost P alo the Wire Bpasses along around so enoid 28 through the snap-' switch 63 throughpost 67 and along the wire J it being the line of least resistance,thence along wire F, through the collar 3 and flexible conductor G,thence through the carbons, the rod 18 and wire H as hereinbeforedescribed.

By the short circuitin as described, of the solenoid 27 whereby it isrendered inoperative, the carbon 49 drops; the passing of the currentthrough solenoid 28 causes again the actuation of the walking beamwhereby the carbon is again instantly raised and the arc-continued. Asthe arc is continued to be produced by this circuit the heat-coil 54gradually cools and shrinks and allows the rocker-bar to reassume itsinitial position, the snap-switch again comin into contact with the pdst66 and restab 'shin the circuit through D as hereinbefore escribed. Solong as the current continues to flow, the operation of the lamp asdescribed, will contlnue. The adjustment shown herein causes a change inmagnetization of the solenoids to occur at intervals of about five toten minutes each; by this adjustment the amount of carbon consumedbetween changes is so sli ht that the raise or increase of the arc v0tage does not exceed one or two volts, whereas in lamps controlled byeither the shunt or differential principle with the construction andarrangement oi parts for the operation of same as have been hithertodevised, the arc voltage will creep from five to twenty five volts.

When, by the consuming of the carbon 49, the carbon-holder in which itis retained has reached its lowermost position, as determined by theslot 5 in the sheath-tube, as shown in Fig. 8, the circuit D will beopened, and the starting resistance circuit through the coil 0 contactplates 25 and 26 the switch 44 and the wire B will be reestablished.

What I claim as my invention and desire to secure by Letters Patent, is:

1. In an electric arc lamp, a circuit that is divided, an electroresponsive device in each division of the circuit, a movable memberadapted to be actuated ,by said electro responsive devices, a clutch toengage the mova le electrode, means to cause the electro responsivedevices to be alternatel energized, connections between said mova lemember and the clutch so that with each movement of the movable memberthe clutch will release and then pick up the movable electrode. 4 2. Inan electric arc lamp, a circuit that is divided, an electro-responsifedevice in each division of the circuit, aniovable member adapted to beactuated by said electroi-na sponsive devices, a clutch to engage themovpost 67, thus opening the i able electrodef a thermostat. to

electro responsive. devices to be alternatel i" ener ized, connectionsbetween said mo 1 mem er and the clutch so that with, each movement ofthe movable member the clutch will release and then pick up the movableelectrode. V 3. In an electric arc lamp, a circuit that is divided, amovable electrode, an electro-re f sponsive device in each division ofthe circuit, a walking-beam adapted to be actuated when saidelectro-responsive devices'areenergized, a clutch to engage the movableelec-' trode, means to cause the electro-responsive devices to bealternately ener zed, connections between the said walking cam and theclutch so that with each movement of the walking-beam the clutch willrelease and then pick up the movable electrode.

4. In an electric arc lamp, a circuit that is divided, a movableelectrode, a solenoid in each division of the circuit, a walking beam tothe end of which the cores of the solenoids are connected, a clutch toengage the'movable electrode, means controlled by the current in thecircuit to cause the solen01ds to be alternately energgzed, connectionsbetween the said walkingearn and the clutch so that with each movementof the walking-beam the clutch will release,and then pick up the movableelectrode.

5. In an electric arc lamp, a circuit that is divided, a movableelectrode, a solenoid in each division of the circuit, a walkin -beam tothe ends of which the cores of the so enoids are secured, a clutch toengage the movable electrode, a switch to throw'the current from onesolenoid to the other, a thermostat actuated by the current in thecircuit to move the said switch, connections between the saidwalking-beam and the clutch so that with each movement of theWalking-beam the clutch will release and then pick up the movableelectrode.

6. In an electric arc lamp, a circuit through the lamp that is divided,a movable electrode, a solenoid in each division of the circuit; awalking-beam to the opposite ends of which the cores of the solenoidsare secured, a clutch to engage said movable electrode, a trip for saidclutch, means to switch the current of said circuit through the saidsolenoids alternately, a pair of vertical bars pivotally connected tosaid walking-beam, one on each side of the center thereof and slotted attheir lower ends, there bein an arm extended from each of said verticalIiars and centered one above the other and having a cushioning devicebetween 'said arms, a cross-bar having its ends slidin ly secured to thelower ends of said vertical bars and having a vertical bar securedthereto. with its lower end ivotall connectedrdao said cluiph, substant'y as escribed.

7. In an electric arc lamp, an electric circuit through the lanip thatis divided, a movable electrode, a solenoid in each division of circuit,a walking-beam to the op ends of which the cores of the solenoi s aresecured a ring-clutch to engage said movable electrode, a p atform forsai ring-clutch to rest on, means to switch the current of said circuitthrough said solenoids alternately, a

pair of vertical bars pivotally connected to said walking-beam one oneach side of the center thereof and slotted at their lower ends,

' clutch, to rest on, means to switch the ourconnect rent of saidcircuit through said solenoids alternatglipa pair of vertical barspivotall to said walking-beam one on eac side of the center-thereof andslotted at their lower ends, a cross-bar having1 its ends slidinglsecured to the lower en s of said ver tic bars and having a vertical barsecured thereto with its lower end pivotally connected to saidring-clutch, a resistance circuit, a bridging member carried by the saidvertical bar to connect the said resistance circuit with the maincircuit, substantially as described.

9. In an electric arc lamp, a movable electrode, a circuit that isdivided, a solenoid in each division of the circuit, a switch, athermostat influenced by the current of the circuit to cause theswitching of the "current to the solenoids alternately, a clutch to engae the movable electrodes, a platform for t e clutch to rest on,mechanisms having connections with the cores of said solenoids and withthe said clutch so that with the switching of the current of the circuitfrom one solenoid to the other the electrode will be released and thenpicked u 10. In an electric arc lamp, the combination of a frame, amovable e ectrode, a pair of uprights on each side of said frame, asolenoid supported by and between each pair of osite ing the e uprights,a pair of transverse standards supported by and joining the upper endsof said pairs of uprights at a right angle thereto, a walking-beamivotally supported on said standards divi edat its center and havingknife-edge bea s to rest on said standards, and having its on 5 adaptedto be secured to the cores'of the solenoids, and secondary armsextending therefrom to e age the connections for engagement of theelectrode, substantially as described.

11. In an electric arc lam a guide for a movable electrode, means ormoving and holding the said electrode, a clutch secured to said movingand holdingmeans and engaging the electrode, a transverse platesupported adjacent said electrode and above the clutch, a memberdisposed on said plate with the lower side thereof in position to engageand stop the movement of the clutch, and means for holding the saidmember in different positions.

12. In an electric arc lamp, a guidefor a movable electrode, a pair ofposts op ositely located parallel with the movable e ectrode when inosition, means for moving and holdectrode that lies between said posts,a clutch secured to said moving and holding means and engaging theelectrode, a transverse plate secured to said posts, a member pivoted tosaid plate with the lower side thereof in position to engage and stopthe movement of said clutch, and means for holding the said member indifferent positions.

13. In an electric arc lamp, a guide for a movable electrode, means formoving and holding the said electrode, a clutch secured to said movingand holding means and engaging the electrode, a transverse plate soported adjacent the electrode, and above t 10 clutch, a member pivotallydisposed on said plate the lower side of said member being adapted to eage and stop the movement of the clutch, an having a pointer thereon,and means for setting and holding the said memher in differentpositions.

In testimony whereof I have signed my name to this specification in thepresence of twosubscribing witnesses.

WILLIAM F. l/VARNER Witnesses: K

JOHN J. HARTLEY, CLARA A. PRIDDY.

